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x86: use generic percpu on 64-bit

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x86_64 provides an optimized way to determine the local per cpu area
offset through the pda and determines the base by accessing a remote
pda.

Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
travis@sgi.com 2008-01-30 13:32:52 +01:00 committed by Ingo Molnar
parent 0af8a5ccc5
commit 072a1e6953
1 changed files with 2 additions and 21 deletions
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23
include/asm-x86/percpu_64.h
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@ -12,21 +12,10 @@
#include <asm/pda.h>
#define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset)
#define __my_cpu_offset() read_pda(data_offset)
#define __my_cpu_offset read_pda(data_offset)
#define per_cpu_offset(x) (__per_cpu_offset(x))
/* var is in discarded region: offset to particular copy we want */
#define per_cpu(var, cpu) (*({ \
extern int simple_identifier_##var(void); \
RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)); }))
#define __get_cpu_var(var) (*({ \
extern int simple_identifier_##var(void); \
RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); }))
#define __raw_get_cpu_var(var) (*({ \
extern int simple_identifier_##var(void); \
RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); }))
/* A macro to avoid #include hell... */
#define percpu_modcopy(pcpudst, src, size) \
do { \
@ -36,16 +25,8 @@ do { \
(src), (size)); \
} while (0)
extern void setup_per_cpu_areas(void);
#else /* ! SMP */
#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
#define __get_cpu_var(var) per_cpu__##var
#define __raw_get_cpu_var(var) per_cpu__##var
#endif /* SMP */
#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
#include <asm-generic/percpu.h>
#endif /* _ASM_X8664_PERCPU_H_ */